This change ports the JavaScript side of the config forms app to use TypeScript and spina. For the most part this is a very straightforward port. The only annoying thing was I discovered that the `ListItem` implementation allowed passing in an `actions` parameter which was treated as an option arg, but was actually being passed in as part of the attributes (despite not being an attribute on the model). This was only used inside of our unit tests (which have themselves been updated to use `setActions`), but I've added some compatibility code to emit a deprecation warning just in the very unlikely case that someone was using this. Testing Done: Ran js-tests.